Loading skip



A g- 1929- s. SHAFER, JR 1*,723,447

LOADING SKIP 2 Sheets-Sheet 1 Filed Dec. 28, 1926 gwuento'c Samuel S/zaj'er; J21,

@4101 new Auglfi, 1929- s. SHAFER, JR 7 1,723,447

LOADING SKIP v Filed Dec. 28, 1926 2 Shets-Sheet 2 gwuentoz Jamaal S/zaj'er; J2;

attocnaq Patented Aug. 6, 1929.

UNITED STATES.

SAMUEL SHAFER, JR, OFMILWAUKEE, WISCONSIN.

LOADING SKIP.

Application filed December 28, 1.926.

This invention relates to leading skips for concrete mixers and has for one of its objects to provide an apparatus oi? this character which will. be simple in construction, coinparatively inexpensive to 'maiurtacture and more ellicientin use than those which have been heretofore proposed.

A further object of the invention is to pro- 'vide a loading skip ol? the pivoted vertically swinging type in which provision is nuide for insuring that the skip will always be in proper load receiving position at its lowermost point of travel.

lVith the above and other objects in view which will appear as the description proceeds, the invention consists in the novel details of construction and combinations of parts more fully hereinafter described and particularly pointed out in the appended claims.

Referring to the accompanying drawings iorniing a part of thisspecification in which like reference characters designate like parts in all the views: 1

Figure 1 is'an end elevational. view of a concrete mixer of the well known tilting drum type showing a loading skip constructed in accordance with the present invention applied thereto, the skip being shown in its two ex treme positions; and, w

Fig. 2 is a view similar to Fig. 1, but showing the skip in two intermediate positions.

Referring more particularly to the said drawings, the numeral indicates generally, the frame work of a concrete inixer upon which is suitably mounted the rotatable and tiltable mixing drum 11 of any suitable and well known construction. The loading skip constituting the present invention and which is adapted to supply materials to thedrum 11 con'iprises a receptacle 12 of suitable shape which receptacle is pivoted as by the trunnions 13 to the outer end to a pair or arms 14:, the inner ends of which are pivotally mounted as at 15 to a portion of the frame 10. The

trunnions 13 are located some considerable distance from the discharge end of the skip so that the center of gravity of the load which may be carried by the latter may lie on one on its pivotal supports 13 so that if the center Oil gravitythereot, whether loaded or empty, be on one side of its pivotal axis it will occupy Serial No. 157,537.

of the frame 10 which sheave or drum may be driven by any suitable connections from the source of power which revolves the mixing drum 1.1.

The receptacle 12 is provided with a pair of stop pins or projections 19 extending laterally from the said receptacle and which are adapted to engage the under surfaces oi the arms 14 as indicated in full lines in Fig. 1, to limit the movement in a clockwise direction of the receptacle 12 relative to the arms 1 1.

The frame 10 is pro vidcd with a transversely extendingrod or bar 20 adjacent its upper end which adapted to be engaged by. a hook member 21 carried by the receptacle 12 as will be clear from the drawings.

The operation of the skip is as follows:

Starting with the parts in the full line position shown in Fig. 1, a charge of material for formingconcrete is deposited in the receptacle 12 which owing to its shape, as illustrated in the said figure, will so position the charge that the center of. gravity of the receptacle and charge will be located somewhere to the right of the pivots 13' as viewed in the said figure. It thus results that when the skip is raised through force applied to the cable 16 that the turning moment of the recep tacle about its trunnions 13 will be in a clockwise direction. However, the pins or stops 19 will, through their contact with the under surfaces of the arms 14, limit such clockwise movement and as the cable 16 is wound. upon its drum 18 the receptacle 12 and arms 14; will be raised as a unit about the pivots 1.5 of the said arms, until the parts reach the broken line position illustrated in Fig. 2. At this point, the upper edge 12 of the recep- .acle will contact with the transverse bar 20 of the frame, thereby arresting further movement of the receptacle 12 in unison with the arms 14, and as the cable 16 is continued to be wound upon the drum 18 thereby continuing the raising of the arms 14:, the receptacle 12 will be caused to tilt or move about its trunnions 13 in a counterclockwise direction until ithas assumed substantially the position illustrated in full lines in 2. At this point the extreme end of the hook 21 en the rod or bar as will be cl ar from Fig. 2, and as the lifting is still further continued, the said book will embrace the said bar until the parts have assumed substantially the position illustrated in dotted lines in Fig. 1. At this time the surface 12 will be so inclined that the charge within the rcceptacle will move under the influence of gravity downwardly and into the mixing drum 1]..

During the lowering of the skip, the parts will move through substantially the reverse of the various positions just described during which action the following action will take place.

hen the pull upon the cable 16 is released, the arms 1% will start to move downwardly as indicated by the arrow A in Fig. 2. However, owing to the engagement. of the hook member 21 with the bar 20, a positive turning moment in a clockwise direction will be imparted to the receptacle 12 about its trunnions 13, thereby assuring that the receptacle when itreaches its lowermost position will be in such a position that its surface 12 will be parallel to and engage the ground. A continued lowering of the arms through the release of the cable 16 will cause the parts to successively move from the position shown in dotted lines in Fig: 1, through the various positions shown in F 2 and back to the position shown in full lines in Fig. 1, as will be readily understood.

The engagement of the hook member with the rod or bar 20 is quite important in assuring the proper positioning of the receptacle 12 in its lowermost posit-ion for although the said receptacle is so constructed and pivoted to the arms 14 that its center of gravity is normally to the right of the said pivots 13, as viewed in the drawings, it may happen that owing to the sticking of a portion of the charge within the discharge throat of the receptacle, that the center of gravity thereof is shifted toward the left until it passes the pivots 13. lVhen this condition occurs were it not for the turning movement imparted through the engagement of the hook 21 with the bar 20 as above described, the skip would be lowered with the receptacle 12 in such position that its surface 12 would not be parallel to and engage the ground when the skip reached the lowest position. The receptacle 12 would, therefore, not be in proper position to receive the next charge. However, due to the action above described in connection with the lowering of the skip, the receptacle 12 is at the beginning of the lowering operation, given a positive clockwise movement about its pivots 13 which results in the positive shifting of the center of gravity to the right of the pivots, for in the event any of the preceding charge has stuck in the throat of the receptacle such portions will be dislodged and shifteo so as to again shift the center of gravity toward the right.

Obviously, the stops 19 will serve to limit the clockwise movement imparted to the receptacle by the hook 21 and the bar 20.

l i liile one form of the invention has been thus illustrated and described, it is obvious that those skilled in the art may vary the details of construction as well as the precise arrangements of parts without departing from the spirit of the invention and therefore, it is not wished to be limited to the above disclosure except as may be required by the claims.

il hat is claimed is 1. In a loading skip, a vertically movable arm; a receptacle pivotally carried by said arm, the pivotal connection with the arm being distant from the delivery end of the receptacle whereby the center of gravity of a loaded receptacle may lie either on one side of said pivotal connection or the other, accordingly as said load is disposed in the receptacle, and the receptacle being free to swing on its pivot in response to the location of the center of gravity of the receptacle and load; and means for positively imparting movment to said receptacle relative to said arm, to insure the proper positioning of said receptacle on its downward movement after discharging, for receiving another load of material.

2. The combination with a concrete mixer having a frame, of a loading skip comprising a vertically swinging arm; a receptacle pivotally carried by said arm; means carried by said frame adapted to be engaged by said receptacle in the upward travel of the parts, whereby turning movement is imparted in one direction to said receptacle relative to said arm; and means carried by said receptacle cooperating with the last named means for imparting a turning movement in the other direction to said receptacle during the lowering of the parts.

3. The combination with a concrete mixer having a frame, of a loading skip comprising a vertically swinging arm; a receptacle pivotally carried by said arm; means carried by said frame adapted to be engaged by said receptacle in the upward travel of the parts, whereby a turning movement is imparted in one direction to said receptacle relative to said arm; means carried by said receptacle cooperating with the last named means for imparting a turning movement in the other direction to said receptacle during the lowering of the parts; and means for limiting movement of said receptacle in said last named direction.

hThe combination with a concrete mixer having a frame, of a loading skip comprising a vertically swinging arm; a receptacle pivotally carried by said arm; means carried by said frame adapted to be engaged by said receptacle in the upward travel of the parts whereby a turning movement is imparted in one direction to said receptacle relative to said arm; means carried by said receptacle cooperating with the last named means for imparting a turning movement in the other direction to said receptacle during the lowering of the parts; and means carried by said receptacle and coacting with said arm for limiting movement of said receptacle in said last named direction.

5. The combination with a concrete mixer having a frame of a loading skip comprising a pair of vertically swinging arms pivotally carried by said frame; a receptacle pivotally carried by said arms; a bar rigid With said frame, adapted to be engaged by said receptacle in the upward travel of the parts, whereby a turning movement in one direction is imparted to said receptacle relative to said arms; a hook member carried by said receptacle, adapted to engage said bar, and to imparta turning movement in the other direction to said receptacle during the lowering of the parts; and stops carried by said receptacle engaging said arms for limiting movement of said receptacle in. said last named direction.

SAMUEL SHAFER, J 1:. 

